Which of the following occurs during interphase?
A) Chromatin becomes tightly coiled.
B) Chromosome duplication occurs.
C) Sister chromatids separate.
D) The mitotic spindle forms.
B
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A sequence of amino acids found in a subunit of the ATP synthase enzyme in several species is shown below. Which amino acids are likely to be most important to the function of ATP synthase?
A) Those that are shaded dark blue because the amino acids are identical between species.
B) Those that are shaded light blue because the amino acids are similar, but not identical.
C) Those that are not shaded because the amino acid sequences are different between species.
D) Comparing sequence between species does not indicate which amino acids are important to function.
The organ of Corti is located in the
a. thoracic cavity. b. inner ear. c. abdominal cavity. d. brain stem. e. semicircular canals.
Which of the following male and female reproductive organs is correctly matched with its function
A) ovaries -transports sperm to the vagina B) uterus- site of fetal development C) vagina - transport eggs to uterus D) penis - production of sperm and male sex hormones E) uterine tubes - receives sperm; acts as birth control F) testes - production of eggs and female sex hormones
Which of the following is NOT one of the current Kingdoms used for classification of organisms?
a. Protista b. Fungi c. Eukarya d. Plantae