Proscholar

cytoplasmic organelles are: a. absent in prokaryotic cells and present in eukaryotic cells. b. present in both prokaryotic and eukaryotic cells. c. present in prokaryotic cells and absent in eukaryotic cells. d. absent in both prokaryotic and eukaryotic cells. correct answers a. absent in prokaryotic cells and present in eukaryotic cells E. coli is a useful model system for molecular biology studies because: a. it has a small genome. b. it reproduces rapidly. c. mutants can easily be i...

The eukaryotic cell cycle is composed of four phases in the following order: a. G1; S; G2; M b. G1; G2; S; M c. G1; M; G2; S d. S; G1; G2; M correct answers A The length of time it takes for the cells labeled during DNA synthesis to begin to enter mitosis is a good estimate of the length of the _______ phase(s). a. G1 b. S c. G2 d. M correct answers C In a typical cycling mammalian cell, _______ of the cell cycle is spent in interphase. a. 99% b. 95% c. 75% d. 50% correct answe...

The length of time it takes for the cells labeled during DNA synthesis to begin to enter mitosis is a good estimate of the length of the _______ phase(s). a. G1 b. S c. G2 d. M correct answers c. G2 In a typical cycling mammalian cell, _______ of the cell cycle is spent in interphase. a. 99% b. 95% c. 75% d. 50% correct answers b. 95% The number of cells in the different phases of a population can be determined most easily by using a(n) _______ to measure the amount of DNA per ce...

The plasma membrane barrier to passive diffusion is primarily a function of the membrane's a. phospholipids b. cholesterol c. proteins d. glycoprotein correct answers a mammalian erythrocytes (red blood cells) are particularly useful for studies of the plasma membrane because.. a. they have few peripheral proteins b. they have only one membrane, the plasma membrane c. their plasma membrane is not associated with a cytoskeleton d. their plasma membrane contains no cholesterol correct ...

Which eukaryotic DNA polymerase replicates the lagging strand in the 3ʹ to 5ʹ direction? a. α b. γ c. δ d. None of the above; the lagging strand is replicated in the 5ʹ to 3ʹ direction. correct answers d. None of the above; the lagging strand is replicated in the 5ʹ to 3ʹ direction. DNA polymerases can synthesize DNA: a. de novo, by catalyzing the polymerization of free dNTPs. b. by adding dNTPs to complementary dNTPs on a single-stranded DNA. c. by adding dNTPs to a hyd...

During E. coli DNA replication, all newly synthesized or nascent DNA fragments must have one of the following characteristics a. a 5' hydroxyl and 3' triphosphate b. a 5' triphosphate and 3' monophosphate c. 5' monophosphate and 3' hydroxyl d. 5' triphosphate and 3' hydroxyl correct answers d. 5' triphosphate and 3' hydroxyl Among the 3 DNA polymerases in E. coli, DNA polymerases I and III differ in a number of properties that make DNA polymerase III a more suitable enzyme for c...

A dominant negative mutant is typically one that... correct answers produces a protein that interferes with the function of the protein produced by the normal gene RNA molecules that serve as templates for protein synthesis are called _ RNAs correct answers messenger Transgenic mice are usually produced by... correct answers injecting DNA containing the gene into the pronucleus of a fertilized egg Expression of a human protein in a bacterial cell is best done with human... correct answe...

The simplest eukaryotic genome is found in correct answers Saccharomyces cerevisiae Potential protein-coding regions of genomic DNA containing long stretches of nucleotide sequences that can encode polypeptides and contain no stop codons are called correct answers open-reading frames Analysis of the first bacterial genome to be sequenced, H. influenzae revealed _____ rRNA genes, _______ different tRNA genes, and ______ potential protein-coding genes. correct answers 6, 54, 1743 The firs...

Signaling by neurotransmitters is an example of _______ signaling. correct answers paracrine Peptide hormones and growth factors act on target cells by binding to cell surface and _______ receptors. correct answers soluble extracellular The effect of acetylcholine on the heart muscle cells is to correct answers stimulate one contraction Aspirin inhibits ______ synthesis. correct answers prostaglandin Diacylglycerol and calcium activate _______. correct answers protein kinase C Cal...

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