Even though bacteria lack membrane-bound organelles, such as chloroplasts and mitochondria, they
can still perform the functions of these organelles by localizing certain metabolic enzymes on:
a. the nuclear membranes.
b. the endoplasmic reticulum.
c. the plasma membrane.
d. ribosomes.
e. the cell wall.
C
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Embryonic cell cycles allow the rapid division of cells in the early embryo. These mitotic cell cycles are much shorter in length than the mitotic cell cycles of cells in a mature organism. In the embryonic cell cycles, mitosis takes approximately the same amount of time as it does in the cell cycles of mature cells. What do you think is a result of the embryonic cycle? 32. Following S phase, a human cell would have how many pairs of sister chromatids and individual DNA molecules?
A. 23 pairs of sister chromatids and 46 individual DNA molecules B. 23 pairs of sister chromatids and 92 individual DNA molecules C. 46 pairs of sister chromatids and 46 individual DNA molecules D. 46 pairs of sister chromatids and 92 individual DNA molecules E. 46 pairs of sister chromatids and 184 individual DNA molecules Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about sister chromatids? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following is/are obligate aerobes?
A. Clostridium botulinum B. Escherichia coli C. Micrococcus luteus D. Helicobacter pylori
Suppose that plasma membranes were single layers of phospholipids rather than double layers, and the heads faced the extracellular fluid. The interior of this hypothetical cell would have to be
A) nonpolar only. B) hydrophilic only. C) polar only. D) hydrophobic only. E) hydrophobic and nonpolar.
The medically useful compounds some actinomycetes produce when forming aerial mycelia are called ________.
A. secondary metabolites B. primary metabolites C. inhibitory metabolites D. antimetabolites