After eating a meal, food particles are broken down into simple sugars, which enter the
bloodstream. An increase in blood sugar levels leads to the release of insulin from the
pancreas, and insulin in turn stimulates cells to take up glucose so that blood sugar levels
decrease. This is an example of __________.
a. negative feedback
b. positive feedback
c. homeostasis
d. both negative feedback and homeostasis
D
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As radiation strikes molecules in cells, it creates ____
a. charged atoms called isotopes b. charged atoms called ions c. excess storage of tRNA d. excess copies of mRNA e. excess DNA polymerase
In plants, this type of cell connection, lined by the cell membranes and allowing transport of molecules between cells, is the
A. gap junction.
B. adjacent junction.
C. tight junction.
D. plasmodesma.
E. anchoring junction.
The first amino acid that initiates the eukaryotic polypeptide is
a. any amino acid. b. glutamine. c. methionine. d. N-formylmethionine.
The correct sequence for sperm movement is from the epididymis to the ________ to the urethra
A) seminiferous tubules B) ureter C) vas deferens D) rete testes