Which of the following organelles is not generally found in animal cells?
A) food vacuole
B) centriole
C) endoplasmic reticulum
D) central vacuole
E) mitochondrion
Answer: D
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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?
A. Resulting daughter cells are smaller than the mother cell in the embryonic cell cycles. B. Resulting daughter cells do not contain the same genetic information as the mother cell in the embryonic cell cycles. C. Resulting daughter cells cannot form a mitotic spindle in the embryonic cell cycle. D. Mother cells in the embryonic cell cycle spend the majority of their time in G0. 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 the cell cycle? 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 pathogens does NOT require capsules or a slime layer for attachment?
A) Vibrio cholera B) Streptococcus pneumonia C) Bacillus anthracis D) All of these pathogens require capsules or slime layers for attachment.
Chlorophyll is comprised of a central ________ containing a(n) ________ ion and a(n) ________ side chain.
Fill in the blank(s) with the appropriate word(s).
In which one of the following ways does a proto-oncogene differ from an oncogene?
A) Proto-oncogenes code for proteins that regulate the expression of structural genes; oncogenes code for nucleic acids involved in cell division. B) Proto-oncogenes control normal cell division; oncogenes contribute to the development of cancer. C) When oncogenes become damaged, they become proto-oncogenes. D) Oncogenes activate tumor suppressor genes; proto-oncogenes repress tumor suppressor genes. E) Proto-oncogenes cause cells to self-destruct when damaged; oncogenes cause damaged cells to repair themselves.