ZK
Zybrea Knight
Answers (10)
ZK
Answered
Sea stars and sea urchins operate their tube feet by
A) a hydraulic system that regulates water pressure.
B) cilia transporting hemolymph from chamber to chamber.
C) sticky threads leading from the mouth.
D) actin and myosin fibers that slide and give muscle actions to the five arms or "rays."
E) an extensive net of nerve and muscle cells.
A) a hydraulic system that regulates water pressure.
B) cilia transporting hemolymph from chamber to chamber.
C) sticky threads leading from the mouth.
D) actin and myosin fibers that slide and give muscle actions to the five arms or "rays."
E) an extensive net of nerve and muscle cells.
On Jul 08, 2024
A
ZK
Answered
What serves as the positive stimulus in the control of thyroid hormone secretion?
A) increased metabolic rate
B) high thyroid hormone levels in blood
C) low thyroid hormone levels in blood
D) high thyroid releasing hormones in blood
E) action potential in neurosecretory cells
A) increased metabolic rate
B) high thyroid hormone levels in blood
C) low thyroid hormone levels in blood
D) high thyroid releasing hormones in blood
E) action potential in neurosecretory cells
On Jul 07, 2024
C
ZK
Answered
The results of the ECG with various leads (arrangements of positive and negative electrodes)are identical, so it does not matter which lead is used.
On Jun 08, 2024
False
ZK
Answered
You are studying the source of a new virus that has recently infected humans. You suspect that the virus was transferred from other primates (they exhibit a similar infection), specifically, chimpanzees, gorillas, or orangutans. You sample blood from several infected humans and sequence some viral genes. You then build a phylogenetic tree with the human sequences and all the known strains from each primate. Draw a hypothetical phylogenetic tree that would suggest that the virus came from gorillas and that this transfer occurred twice independently. Label chimpanzee sequences (c), gorilla (g), orangutans (o), and humans (h).
On Jun 06, 2024
The hypothetical phylogenetic tree would show two separate clusters of human sequences, each closely related to gorilla sequences. The first cluster would be labeled with gorilla (g) and human (h) sequences, indicating the first transfer event from gorillas to humans. The second cluster would also be labeled with gorilla (g) and human (h) sequences, indicating a second independent transfer event from gorillas to humans. The chimpanzee (c) and orangutan (o) sequences would be more distantly related to the human sequences, suggesting that the virus did not come from these primates. This phylogenetic tree would support the hypothesis that the virus came from gorillas and that there were two separate transfer events from gorillas to humans.
ZK
Answered
Babies generally appear to be immune to diseases for approximately the first six months of life. What could be responsible for this immunity?
A) active immunity due to the mother
B) passive immunity from the mother
C) babies not being exposed to diseases until around six months
D) babies born with excellent active immunity that wanes the older the child gets
E) active immunity due to being exposed to numerous antigens during the birthing process
A) active immunity due to the mother
B) passive immunity from the mother
C) babies not being exposed to diseases until around six months
D) babies born with excellent active immunity that wanes the older the child gets
E) active immunity due to being exposed to numerous antigens during the birthing process
On May 09, 2024
B
ZK
Answered
Veins that return blood directly to the heart include the ________.
A) brachiocephalic vein
B) superior vena cava
C) portal vein
D) azygos vein
E) pulmonary arteries
A) brachiocephalic vein
B) superior vena cava
C) portal vein
D) azygos vein
E) pulmonary arteries
On May 07, 2024
B
ZK
Answered
Which of the following crosses will yield only homozygous recessive offspring?
A) RRYY × RRYY
B) RRYY × rryy
C) RrYy × rryy
D) rryy × rryy
E) RrYy × RrYy
A) RRYY × RRYY
B) RRYY × rryy
C) RrYy × rryy
D) rryy × rryy
E) RrYy × RrYy
On May 06, 2024
D
ZK
Answered
The junction of a neuron with another cell is a/an ________.
A) synapse
B) ganglion
C) receptor
D) effector
A) synapse
B) ganglion
C) receptor
D) effector
On May 05, 2024
A
ZK
Answered
Which of the following structures helps to regulate body temperature?
A) Glomus
B) Tunic
C) Fenestrae
D) Metarteriole
A) Glomus
B) Tunic
C) Fenestrae
D) Metarteriole
On May 04, 2024
A
ZK
Answered
What structure do bacteria use during conjugation?
A) pili
B) flagella
C) ribosomes
D) plasma membrane
E) no bacterial structure; it relies on viral transfer
A) pili
B) flagella
C) ribosomes
D) plasma membrane
E) no bacterial structure; it relies on viral transfer
On May 02, 2024
A