Which of the following statements about DNA methylation in eukaryotes is false?
(a) Appropriate inheritance of DNA methylation patterns involves maintenance methyltransferase.
(b) DNA methylation involves a covalent modification of cytosine bases.
(c) Methylation of DNA attracts proteins that block gene expression.
(d) Immediately after DNA replication, each daughter helix contains one methylated DNA strand, which corresponds to the newly synthesized strand.
(d)
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Which of the following statements are correct?
I) Hormones often regulate homeostasis through antagonistic functions. II) Hormones of the same chemical class usually have the same function. III) Hormones are secreted by specialized cells usually located in exocrine glands. IV) Hormones are often regulated through feedback loops. A) only I and II B) only II and III C) only I and III D) only III and IV E) only I and IV
In the figure above, which number identifies the structure that transmits auditory signals to the brain?
a. 2 b. 6 c. 7 d. 8 e. 9
The disease that we know as diabetes mellitus was
detected by urine examination around the year __________ by physicians in __________. a. 1000 BC; India b. 500 BC; China c. 500 AC; Africa d. 1000 AC; Russia e. 1500 AC; France
For two types of organisms to belong to the same species, they must
A. look alike. B. live in the same geographic region. C. be able to naturally produce fertile offspring. D. contain the same gene frequencies.