Which of the following statements is true of asexual reproduction?
A.) It produces few offspring.
B.) It produces genetically identical offspring.
C.) It produces genetic diversity.
D.) It produces offspring that are resistant to antibiotics.
Answer: B.) It produces genetically identical offspring.
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How can humans perceive multiple sounds at once?
a. Each portion of the basilar membrane vibrates at a unique frequency, and multiple regions can be stimulated at the same time. b. The more frequencies of sounds that are present, the further the sound travels into the cochlea. c. We have two ears, each perceiving a subset of frequencies in the environment. d. The fluid in the middle ear can transmit multiple frequencies to the oval window. e. Sounds reaching the left or right ear result in different nerve impulses.
The structure at letter "B" is the ____ which ____
a. tongue; produces speech b. epiglottis; closes the larynx c. larynx; produces sound d. epiglottis; closes the esophagus e. pharynx; holds the trachea open
What is the region in the middle of a replicated chromosome that connects sister chromatids?
A) centriole B) centromere C) karyotype D) chromatid
How is the HIV provirus different from a lambda-phage prophage?
A. the HIV provirus is integrated permanently into the host cell's DNA. B. all subsequent generations of HIV-infected cells carry the provirus. C. all the offspring of a cell infected with a prophage will contain the virus. D. the HIV provirus is inactive inside the host cell. E. lambda phage-infected cells produce virus slowly over time.