Which of the following provides the specificity of the PCR reaction?
a. primers
b. separated DNA strands
c. heating to 94°C
d. Taq polymerase
Ans: a. primers
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Which of the following is not involved in the increase in blood volume in a pregnant woman?
A. renin-angiotensin-aldosterone mechanism B. an increase in blood oxygen levels C. artery expansion D. progesterone E. sodium and water retention
In both stems and leaves, photosynthetic tissues lie beneath the __________
a. cortex b. periderm c. pith d. epidermis e. sclerenchyma.
Which of the following is true of cardiac muscle?
A. Cardiac muscle tissue has both an intracellular and extracellular source of Ca++. B. Cardiac muscle tissue has slow Ca++ voltage gates in the membrane that make cardiac muscle incapable of tetanus. C. In cardiac muscle tissue, excitation spreads from cell to cell via intercalated disks. D. Cardiac muscle tissue does not require nerve activity to stimulate a contraction. E. All of these are true of cardiac muscle.
What advantage does the activity of osteoblasts and osteoclasts impart to vertebrates, even after growth has finished?
A) As old bones are dissolved, new bones can be formed. B) The cells enable bone to lengthen and shorten as needed. C) Bone growth never finishes; it continues at a slow pace throughout life. D) The cells allow bone to get stronger as physical demands are placed on it.