Biology 151 Exam questions with Verified answers -New Update,

Biology 151 Exam questions with Verified |\ |\ |\ |\ |\ |\




answers -New Update
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Which of the following statements are true regarding plasma
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membranes and phospholipids? |\ |\ |\




I. All animal and plant cells, but not bacterial cells, have plasma
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membranes. |\




II. Saturated fatty acids contain no double bonds.
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III. The hydrophilic head groups of phospholipids are found in the
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interior of the lipid bilayer. |\ |\ |\ |\




IV. Phospholipids are amphipathic. - CORRECT ANSWERS ✔✔II and
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IV
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The skin cells have high concentrations of cholesterol (in the
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plasma membranes). What does this mean for the fluidity of
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those cells compared to cells with low cholesterol concentrations?
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- CORRECT ANSWERS ✔✔At high temperatures, these skin cells
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are less fluid than cells with less cholesterol.
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The heart pumps blood around the body. Calcium ions (Ca2+)
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play an important role in the electrical activity and pumping
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function of the heart. When voltage-gated calcium ion channels
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open in heart muscle cells, Ca2+ ions rush into the cytoplasm.
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This is an example of: - CORRECT ANSWERS ✔✔Facilitated
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diffusion


Which parts of this system are primary active transport and
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which are secondary active transport; the Na+/Ca2+ exchanger
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, pump and the sodium-potassium pump (Na+/K+)? - CORRECT
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ANSWERS ✔✔The Na+/K pump is primary active transport and |\ |\ |\ |\ |\ |\ |\ |\ |\


the Na+/Ca2+ exchanger is secondary active transport.
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. Which of the following correctly describes what happens in the
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Na+/Ca2+ exchanger? - CORRECT ANSWERS ✔✔Na+ moves |\ |\ |\ |\ |\ |\ |\


down its concentration gradient and Ca2+ moves up.
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You're studying the HSC gene, which is expressed only in
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hematopoietic cells. Hematopoietic cells are adult stem cells that |\ |\ |\ |\ |\ |\ |\ |\


give rise to other blood cells. You want to obtain samples of the
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HSC gene for your BIO 151 Exam 1 Zehnder Fall 2021 5
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experiments. You have access to white blood cells (differentiated |\ |\ |\ |\ |\ |\ |\ |\ |\


blood cells), embryonic stem cells, and hematopoietic cells. From
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which cells could you obtain the HSC gene? - CORRECT ANSWERS
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✔✔From hematopoietic cells, embryonic stem cells, and white
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blood cells. |\




Which of the following statements are true regarding stem cellsI.
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Stem cells are found in embryos and are not present in adult
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tissues or organs. |\ |\ |\




II. Stem cells divide and differentiate to replace old cells or cells
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lost to injury or disease.
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III. Totipotent stem cells contain more DNA than multipotent stem
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cells. - CORRECT ANSWERS ✔✔II only
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What is the immediate next step after TK2 is phosphorylated by
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TK1? - CORRECT ANSWERS ✔✔TK2 phosphorylates the
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transcription factor |\