Sex-influenced traits are expressed ____
a. aftafter the formation of a Barr body
b. more in males than in females
c. as a result of hormone differences between males and females
d. only in males
e. only in females
c
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Which of the following statements best distinguishes scientific hypotheses from scientific theories?
A) Hypotheses describe and theories explain. B) Hypotheses explain and theories describe. C) Hypotheses are usually narrower in scope; theories have broader explanatory power. D) Hypotheses are used in experiments. Theories are not tested. E) Hypotheses are generally supported by more evidence than theories.
A person sensitive to bee stings may die minutes after a sting due to
a. a collapse of the immune system. b. a clogging of the capillaries. c. a release of excessive fluids from the capillary beds. d. respiratory distress caused by excessive mucus. e. the extremely sharp rise in blood pressure.
The ________ joints have no joint cavity and usually do not permit movement. Sutures between skull bones are this kind of joint
Fill in the blank(s) with correct word
The concentration of a particular protein, X, in a normal human cell rises gradually from a low point, immediately after cell division, to a high point, just before cell division, and then drops sharply
The level of its mRNA in the cell remains fairly constant throughout this time. Protein X is required for cell growth and survival, but the drop in its level just before cell division is essential for division to proceed. You have isolated a line of human cells that grow in size in culture but cannot divide, and on analyzing these mutants, you find that levels of X mRNA in the mutant cells are normal. Which of the following mutations in the gene for X could explain these results? (a) the introduction of a stop codon that truncates protein X at the fourth amino acid (b) a change of the first ATG codon to CCA (c) the deletion of a sequence that encodes sites at which ubiquitin can be attached to the protein (d) a change at a splice site that prevents splicing of the RNA