Clay from this period has high levels of _____, an element commonly found in a(n) ______.
What will be an ideal response?
iridium, meteorite
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Which of the following statements about maternal-effect genes is not correct?
A. Maternal-effect genes are expressed by the mother but affect the phenotype of the offspring. B. The composition of RNA and proteins in an oocyte is not uniform across the cell. C. bicoid and nanos mRNA and protein in Drosophila oocytes are localized either in the anterior (bicoid) or posterior (nanos) of the egg. D. The anterior-posterior axis set up by gradients of Bicoid and Nanos proteins is reinforced by gradients of two transcription regulators called Caudal and Hunchback. E. The caudal and hunchback mRNAs are transcribed in the egg and then transported back to regulate the mother's genome.
An _____ is a nonphotosynthetic plant—a third member of a symbiotic relationship involving a fungus and another plant, obtaining nutrients from these two members.
Fill in the blank(s) with the appropriate word(s).
Replication of DNA produces
a. RNA molecules. b. only new DNA. c. two DNA strands that are both copies of the parent strand. d. one completely new DNA strand and the old parent strand is degraded. e. new proteins.
When you are ill and have a fever, your body’s internal thermostat has reset your internal set point as a protective mechanism. Which part of the body regulates this protective mechanism?
a. heart b. muscle tissue c. hypothalamus d. vascular tissue