The sequence of events that cause a sarcomere to contract can be summed up in the correct order as
A) detach, extend, contract, attach.
B) attach, pull, extend, contract.
C) detach, extend, attach, pull.
D) attach, contract, detach, recoil.
Answer: C
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The Hershey and Chase experiments, in which radioactive phosphorus (32P) and radioactive sulfur (35S) were used,
demonstrated that ____.
a. DNA labeled with 35S and proteins labeled with 32P can be traced over the course of an experiment b. DNA labeled with 32P is transferred from the bacteriophage to the virus c. proteins labeled with 35S become deactivated and unable to be transferred d. bacteriophages transfer their DNA, not their coat proteins, into their hosts e. DNA may be the hereditary material, although bacteriophages transfer both DNA and proteins into their hosts
Some green algae exhibit alternation of generations. All land plants exhibit alternation of generations. No charophytes (stoneworts) exhibit alternation of generations
Keeping in mind the recent evidence from molecular systematics, the correct interpretation of these observations is that _____. A) charophytes are not related to either green algae or land plants B) plants evolved alternation of generations independently of charophytes C) alternation of generations cannot be beneficial to charophytes D) land plants evolved directly from the green algae that perform alternation of generations E) scientists have no evidence to indicate whether or not land plants evolved from any kind of alga
In 2003 a French family was studied in which three of four brothers had undeveloped testes, sparse pubic hair, and a lack of sexual development. All three affected men were homozygous for a genetic mutation that prevented puberty
That mutation could possibly be a defect in any of the following EXCEPT: A. GPR54 gene. B. KISS-1 gene. C. GnRH gene. D. gonadotropin coding genes (LH and FSH). E. testosterone gene.
In the mitochondria, hydrogen is actively pumped to the ____.
A. inner membrane B. outer membrane C. intermembrane space D. matrix E. cytoplasm