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BIOL1104 Exam 4 Questions With Complete Solutions
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BIOL1104 Exam 4 Questions With Complete SolutionsA baby born before 37 weeks is considered? Correct Answer
Premature or pre-term
A biological example of a negative feedback loop: Glucose
regulation Correct Answer Parameter: blood glucose level
Change detected: blood glucose level has risen above set point
(detected by beta cells in pancreas)
Cell response: release hormone insulin (a hormone that allows
cells to take glucose out of the bloodstream)
Result: decrease in blood glucose levels
A bunch of alveoli that feed into the same duct? Correct
Answer Lobule
After about a week, the embryo "hatches" out of its protective
covering and implants within the what? Correct Answer
Uterine lining
After puberty, each month the eggs mature in the ovaries inside
of follicles in preparation for what? Correct Answer Potential
fertilization
Amino acid derivatives Correct Answer Most not lipid soluble;
bind to receptors on SURFACE of target cell
,Anime hormones Correct Answer - Derived from a single
amino acid
- Some function more like protein hormones, and some function
more like steroids
- ex. hormones produced by thyroid gland stimulate metabolism
and act like steriods
- ex. catecholamines like epinephrine act like protien
As a fertilized egg travels from the fallopian tube to the uterus to
implant, the cells of the embryo are undergoing what? Correct
Answer Mitosis
As the levels of LH and FSH drop during the luteal phase of the
ovarian cycle, what other levels also start to drop? Correct
Answer - Estrogen
- Progesterone
Barrier/physical methods of contraceptives? Correct Answer -
Interfere with physical reproductive anatomy or structures, both
male and female methods
- Condoms (male and female, can also protect against STI's)
- Diaphragms
- Sponges
- Spermicides
- The Copper IUD
- Sterilization
Breastfeeding is a process that is regulated by? Correct Answer
Hormones
,Cells that make and release hormones? Correct Answer
Endocrine cells
Change in a parameter in one direction triggers a response that
moves that parameter in the opposite direction.
The counteraction of an effect by its own influence on the
process that gives rise to it. Correct Answer Negative feedback
Change in a parameter in one direction triggers a response that
moves that parameter in the same direction?
In other words, the enhancement or amplification of an effort
caused by its own influence on the process that gives rise to it.
Correct Answer Positive feedback
Examples of what a protein hormone could do? Correct Answer
- Initiate a signal transduction to alter the activity of an enzyme
in the cytoplasm
- Initiate a signal transduction to move a molecule from one part
of the cell to another
Examples of what a steroid hormone (lipid-soluble) could do?
Correct Answer - Turn off a gene (stop making proteins)
- Turn on a gene (start making proteins)
- Turn up gene expression (make more proteins)
- Turn down gene expression (make fewer proteins)
Explain the roles that Leydig and Sertoli cells play in sperm
development, and the hormones involved? Correct Answer 1.
, Luteinizing hormone (LH) binds to its receptor on Leydig cells
and stimulates production and secretion of testosterone
2. Follicle-stimulating hormone (FSH) binds to its receptor on
Sertoli cells and WEAKLY stimulates spermatogenesis
3. Testosterone from Leydig cells binds to receptors in nuclei of
Sertoli cells and also WEAKLY stimulate spermatogenesis
4. The binding of FSH to its receptor increases the expression of
testosterone receptors. Thus, spermatogenesis is STRONGLY
stimulated ONLY when both FSH and testosterone are present
in the Sertoli cells
gestation period Correct Answer the length of time between
fertilization and birth
Gestation period is often discussed in what? Correct Answer -
Thirds (or trimesters) each about 3 months long
Hollow spaces for milk to pool in the breast? Correct Answer
Alveoli
Hormonal methods of contraceptives? Correct Answer -
Interfere with hormone cycles to prevent ovulation or
fertilization; female methods only
- The pill
- Emergency contraception
- The ring & the patch
- The hormonal IUD & the implant
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