Smooth muscle in the arteriole walls can vasoconstrict or vasodilate, which:a
helps to regulate blood pressure.
b. helps to accelerate the flow of blood through the vessels.
c. prevents the back flow of blood into the tissues.
d. squeezes oxygen out of the blood.
e. adds strength to the blood vessels.
A
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A botanist is studying the growth rings of a redwood tree. She notices that three concentric rings are very thin compared to the surrounding growth rings. What can she deduce from the occurrence of these thin growth rings?
A. The tree developed more apical shoot meristems during that time period. B. The tree may have experienced a drought or had limited access to nutrients during that time period. C. The tree developed more secondary xylem during that time period. D. The tree had ample access to water and other resources during that time period.
Sperm cells swim actively using their flagellum. To support this activity, these cells have high
numbers of __________.
a. mitochondria b. endoplasmic reticulum c. muscles d. ribosomes
A typical cell cycle consists of
a. mitosis and meiosis. b. G1, the S phase, and G2. c. prophase, metaphase, anaphase, and telophase. d. interphase, mitosis, and cytokinesis. e. meiosis and fertilization.
A DNA fragment with the sticky end sequence TGGCA will bind with another DNA fragment with the sticky end sequence ________.
A) TGCCA B) ACCGT C) TGGCA D) ACGGT