Which of the following first appears in a third trimester human fetus?
a. lanugo hair
b. open eyes
c. facial expressions
d. sucking movements
e. heart beats
ANSWER: b
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The process of recombination may rarely occur during mitosis
Indicate whether the statement is true or false
Answer the following statements true (T) or false (F)
1. In the bacterium E. coli, in the absence of lactose, a repressor protein binds to the operator region of the DNA, preventing the transcription of the genes of the lactose operon. 2. In eukaryotic cells, gene expression may be controlled by not allowing mRNA to leave the nucleus. 3. A somatic mutation is a mutation that occurs in cells that give rise to gametes. 4. A bacteriophage infects a bacterial cell by injecting nucleic acid into the bacterium. 5. The components of DNA that produce an organism's genetic information are the deoxyribose nucleotides.
The sclera is indicated by
a. A. b. B. c. C. d. D. e. E.
Which one of the following has the cellular components arranged in order of increasing size?
A) Amino acid < protein < mitochondrion < ribosome B) Amino acid < protein < ribosome < mitochondrion C) Amino acid < ribosome < protein < mitochondrion D) Protein < amino acid < mitochondrion < ribosome E) Protein < ribosome < mitochondrion < amino acid