Flattened sacs of internal membranes associated with photosynthesis are called
A. chloroplasts.
B. photosystems.
C. the stroma.
D. thylakoids.
E. cristae.
D. thylakoids.
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Which of the following is a muscle tissue that pumps blood throughout the body?
A. Skeletal muscle B. Cardiac muscle C. Smooth muscle D. Endocardium
Which of the following contributes to asymmetric cell division in a developing embryo?
A. diffusible molecules secreted from one cell detected by another cell B. developing gradients of mRNA that define critical axes C. cell division occurring perpendicular to the mRNA gradient D. All of the choices are correct.
Based on the principle of parsimony, which species shares a most recent common ancestor with a species having the sequence TTACC?
Consider the following DNA sequences for four different species: 1: AATCG 2: TAATG 3: ATACC 4: ATAGG A. Species 1 B. Species 2 C. Species 3 D. Species 4
The figure below shows a cell in the mitotic stage of ________.
a. anaphase. b. prophase. c. interphase. d. telophase. e. metaphase.