An important mineral ion of the cytochrome pigments of cellular respiration is ___

A. Iron
B. Zinc
C. Calcium
D. Magnesium
E. Potassium


Answer: A. Iron

Biology & Microbiology

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A male fruit fly has the genotype PpYYrrTt. In terms of these 4 allele pairs, how many different types of gametes can he form?  

A.  2 B.  4 C.  8 D.  16 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about alleles and gametes? 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?

Biology & Microbiology

Horses and donkeys can interbreed, but their offspring (mules) are infertile. This is an example of what kind of reproductive isolating mechanism?

A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, ecological separation D. post-zygotic E. post-zygotic, ecological separation

Biology & Microbiology

Which of the following is a characteristic of fungal cells?

a. Fungal cells have a membrane-bound nucleus. b. Fungal cells have chloroplasts. c. Fungal cells have thin cell walls. d. Fungal cells lack mitochondria.

Biology & Microbiology

A main function of a plant's root system is to:

a. photosynthesize. b. absorb dissolved nutrients and water. c. absorb atmospheric carbon dioxide. d. capture sunlight. e. bear seed-containing fruits.

Biology & Microbiology