Cell: The Unit of Life Questions

Biology

Cell: The Unit of Life Solutions

Why is part of the cell membrane hydrophobic? A) To help dissolve the organelles. B) To keep water out of the cell. C) So the cell can absorb as much water as possible.

Biology

Cell: The Unit of Life Solutions

Anster the following questions 1. What bases are found in RNA? 2. What bases are found in DNA? 3. Which strand is the messenger RNA complementary to? 4. Which strand is the messenger RNA nearly identical to? 5. What proteins help to direct the RNA Polymerase to the right location? 6. The ________ end of a new nucleotide is always added to the _______ end of an existing strand. 7. Distinguish between the following two terms: chromosome and gene.

Biology

Cell: The Unit of Life Solutions

Maurice plans to become a professional wrestler and wants to build his strength. Which is the best strategy for Maurice? A. eating food rich in protein and saturated fat to increase his muscle mass B. devising a training program that builds muscle mass slowly C. taking vitamins or a dietary supplement that is rich in protein

Biology

Cell: The Unit of Life Solutions

4. Post-transformation culture plates After transformation, the bacteria were grown in plates (plates A to D) containing IPTG, X-gal, and the antibiotic spectinomycin. PART 1: 1. What would have happened if we had cultured bacteria from any of the two starter plates in the post-transformation culture plates? 2. Why was the addition of the antibiotic spectinomycin important in the port-transformation cultures?

Biology

Cell: The Unit of Life Solutions

it more difficult to trace back through generations. ANALYZE Why might an evolutionary biologist benefit from studying mtDNA rather than nuclear DNA as evidence for evolution? a.mtDNA mutates at a slower rate, so there are fewer changes to an organism's DNA over time. Ob.mtDNA is inherited from both parents, providing a wider view of inheritance and possible common ancestry. O c.mtDNA is only passed on to females, so scientists are able to better focus their evidence on one sex. Od.mtDNA is only inherited from the mother, making it easier to trace lines of descent. on Miflan Harcourt Publishing Company Ribosomal RNA Ribosomes, which manufacture proteins in cells, contain ribosomal RNA (rRNA). When studying the relationships among slécies over longer time scales, it is best to use a 007 Molecular Evidence.pdf 3 MB VIEW lla E

Biology

Cell: The Unit of Life Solutions

Question 78 1 pts Specialized cells in an animal's pancreas produce insulin which helps to regulate blood glucose levels. What kind of cellular function is it when these pancreas cells release a substance such as insulin? a O receptor mediated endocytosis O arginocytosis O pinocytosis O exocytosis Next

Biology

Cell: The Unit of Life Solutions

Transcription begins at a site on the DNA called a promoter, located immediately before a gene or a set of genes Regarding microorganisms, which of the following statements are FALSE Gram-positive bacteria have a thick cell wall composed primarily of phospholipids and cell membrane a Cell microbes can be divided into those are prokaryotic (bacteria, archaea, plasmid, prions) and those that are eukaryotic (algae, protozoa, and fungi) E. coli growth is better on lactose than on glucose. Glucose will be used before lactose given a choice None of those

Biology

Cell: The Unit of Life Solutions

2. Draw a proposed glycoprotein involved in cell- cell recognition or signaling embedded in a cell membrane. Draw the glycoprotein with five transmembrane regions. Separately, draw only its primary structure, not embedded in the membrane, with hydrophobic and hydrophilic regions labeled.

Biology

Cell: The Unit of Life Solutions

Question P22 Not yet ar Points out P Flag que The Ferry model was developed to describe the gelation behavior of proteins. Which of the statements below is TRUE about the Ferry model (there may be more than one option). 01 SP22 01 SP22 Select one or more: a. When a native protein is heated, it first adopts a "molten globule" state. The protein can undergo reversible conformational changes between the native and molten globule states. b. When a globular protein is heated above a certain temperature, it may undergo an irreversible conformational change. c. After unfolding, the surface hydrophobicity of the proteins may increase, which causes the protein molecules to aggregate, which can lead to gelation (provided the protein concentration is high enough). 01 SP22 LO1 SP22 01 SP22 d. The Ferry model describes the gelation characteristics of gelatin (a protein derived from collagen) hbor-

Biology

Cell: The Unit of Life Solutions

Page 1: 1 2 3 Endosymbiosis theory states that mitochondria and chloroplasts were once prokaryotes that were endocytosed by a larger cell, and came to live in symbiosis with that larger cell rather than being digested in a lysosome. Choose ALL the lines of evidence for this theory from the list below. 4 5 6 7 8 9 001 Mitochondria and chloroplasts are enclosed by a double membrane, which would have happened if they had been endocytosed. 10 11 12 Mitochondria and chloroplasts have their own DNA, separate from the DNA in the nucleus, and that DNA is arranged in a single circular chromosome, just like prokaryotic DNA. 14 15 17 18 Mitochondria and chloroplasts can be removed from the cell and live independently of it. o 21 1 - H Mitochondria and chloroplasts have their own ribosomes to build their own proteins, and the ribosomes are small prokaryotic ribosomes rather than the larger eukaryotic ribosomes. 24 Mitochondria and chloroplasts divide independently of the rest of the cell.

Biology

Cell: The Unit of Life Solutions

1 The "hydrophobic effect" is the driving force behind the spontaneous assembly of the lipid bilayer et cell membranes in water. What does that mean exactly? It means that the non-polar tails of phospholipids are attracted to one another, forming bonds that hold the membrane in place. O It means that the polar structures (i.e. water molecules and the head groups of phospholipids) are atracted to one another, and their clustering repels non-polar structures away, which pushes non-polar tals of phospholipids into a bilayer.

Biology

Cell: The Unit of Life Solutions

Q Question 22 4 pts For this question on biological macromolecules, please pick ONE (and only one!) of the following questions and answer it in a paragraph of approximately 4-5 sentences. Note: this question is worth 4 points. 1. Consider proteins and the 20 amino acids that make them up, and nucleic acids and the 4 nucleotides that make them up. Before James Watson and Francis Crick published their article describing the structure of DNA, researchers debated whether proteins or nucleic acids represented the genetic code of cells. Based on what you know about proteins and nucleic acids, hypothesize why some researchers thought proteins were more likely to represent the genetic code than nucleic acids. Please explain. OR 2. Identify the role of either proteins or nucleic acids in the cell, describe their structure, and give examples of structures they form inside cells. lings OR Com