Because hardly any oxygen (O2) was in the early Earth's atmosphere, the single-celled microorganisms probably used which of the following to produce energy to drive metabolic processes?
A. Aerobic cellular respiration.
B. Anaerobic cellular respiration.
C. Sulfuric acid respiration.
D. Both aerobic and anaerobic cellular respiration.
E. Sulfuric acid, aerobic and anaerobic respiration.
B. Anaerobic cellular respiration.
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Which of the following should be the same in identical twins?
A) the set of antibodies produced B) the set of major histocompatability (MHC) molecules produced C) the set of T cell antigen receptors produced D) the susceptibility to a particular virus E) the set of immune cells eliminated as self-reactive
A genomic ________ is a sufficiently large collection of recombinant DNA molecules in which the inserted sequences together represent the entire genome of an organism.
Fill in the blank(s) with the appropriate word(s).
What is the key concept addressed by the question?
What will be an ideal response?
Calcium ions used for muscle contraction are stored in which part of the muscle cell?
a. the nucleus b. the Golgi apparatus c. the sarcoplasmic reticulum d. the ribosomes e. the lysosomes