How can your knowledge of neural tube formation provide you with an insight into congenital diseases
that involve incomplete neural tube closure?
What will be an ideal response?
In the text, we learned that organogenesis begins with formation of the neural tube. Therefore, we can
assume that diseases that result from an inappropriate neural tube closure occur at a very early
gestational age.
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The protein p53 activates genes that _____
A) increase mutation rate B) lead to higher production of growth factors for the cell C) increase the rate of endocytosis D) arrest the cell cycle
Thermoregulation depends on monitoring of blood temperature. What structure acts as the mammalian temperature sensor?
A. hypothalamus B. peripheral blood vessels C. adrenal medulla D. anterior pituitary gland E. thyroid
Which avenue of research is least likely to reveal whether asexual organisms form species?
a. analyzing whether a cluster of bacteria constitutes a species b. exploring various niches in which different populations reside c. looking into previously undiscovered types of bacteria d. performing genomic research e. hybridizing polyploid plants
Fifty-million sperm were examined for mutations in a specific gene and 100 mutations were found. What was the mutation rate for this gene?
A) 5 × 10?6 B) 50 × 10?6 C) 2 × 10?6 D) 2 × 10?5 E) 5 × 10?5