**SAT 2 Biology Discussion Thread Oct 2015**

Hello Tookme10mins, I think that taking notes is very helpful since simply reading the material isn’t going to retain the information. Goldy, I would have to say that a person with type 1 diabetes cannot produce insulin themselves, thus eating a large meal would cause the blood glucose to sky rocket under glycemic conditions. However, if that individual used an insulin-related drug, then the action from the drug would be to lower blood glucose and transfer it to be saved for other purposes like respiration…I would have to say that the answer is E as well. These certain questions are just not worded well enough.

Thanks 1618dz

https://drive.google.com/file/d/0B-SjC2QWxqXRQ3g5YXBoNW1DMFU/view

Which of the following best describes a pattern of idealized population growth that is restricted by limiting factors?
A. logistic growth model
B. carrying capacity model
C. dispersion model
D. exponential growth model
E. habitat cap model

Why is the answer A and not B?
@1618dz

Primarily due to the idea that the carrying capacity doesn’t have a model, but rather a number of individuals that can hold. Logistic growth includes the limiting factors and carrying capacity. There are two main models: Exponential and Logistic curves.

@goldy1121 I know the Sat II books don’t explain these topics explicitly but there are two graphs logistic and exponential. Exponential has a j curve and doesn’t stop growing or reach carrying capacity whereas the logistic growth has a s curve and grows exponentially until the carrying capacity balances it out. The carrying capacity (K) is just a line that shows what is the limit that an envionment can hold. So it’s not B

Does anyone have tips for punnett squares?

@darkcrescendo. Since you have the blue book, do you think you can post a link to some drive or perhaps write some simple questions cause I’m not allowed to buy any more books other than Princeton and Barrons…

For punnett squares, I just have to say that those are doable. I don’t know much else…

I guess working with codominant traits, like blood type, you should be careful when they ask for “which child belongs to which parent”. Also, using punett squares in pedigrees can be useful when finding out what phenotype or genotype a member in the pedigree is.

(A) Tracheids and vessel elements
(B) Guard cells
© Parenchyma cells
(D) Sieve tube members and companion cells
(E) Sclerenchyma cells

  1. Chains of these nonliving cells form continuous tubes for transport of water is vascular plants.
  2. These cells take up potassium ions and water when sunlight and low concentrations of carbon dioxide are present, which causes them to become rigid.
  3. These versatile cells serve as storage sites for sugars and starches in stems and roots.
  4. These cells form a living tissue which transports sugar from one part of a vascular plant to another.

Today’s worldwide human populations can be best described as
(a) oscillating
(b) declining
© fluctuating near equilibrium
(d) growing arithmetically
(e) growing exponentially

Nitrogen fixation is the conversion of atmospheric nitrogen into
(a) ammonia
(b) protein
© urea
(d) carbon dioxide
(e) DNA

If a couple has two boys and one girl, what is the probability that the next child born to this couple will be a girl?
(a) 1/4
(b) 1/3
© 1/2
(d) 2/3
(e) 3/4

Which of the following statements is true for red blood cells that have been added to a flask of NaCl solution?
(a) The cells will undergo mitosis
(b) The cells will increase in volume
© The cells will lose water
(d) The cells are hypertonic relative to the surrounding medium
(e) The concentration of NaCl is lower outside the cells than inside.

In the fruit fly, the allele for normal wings (W) is dominant over the allele for vestigial wings (w). A cross of two normal-winged flies produced 76 normal-winged and 23 vestigial-winged off-spring. It can be concluded that the genotypes of the two parent flies were which of the following?
(a) WW and ww
(b) WW and Ww
© Ww and ww
(d) Ww and Ww
(e) WW and WW

The gene for a particular trait that is passed only from fathers to sons is most likely
(a) autosomal recessive
(b) autosomal dominant
© codominant
(d) Y-linked
(e) X-linked

All of the following are measures useful in describing a given population’s growth rate EXCEPT
(a) fertility
(b) mortality
© survivorship
(d) age structure
(e) habitat

A man who has hemophilia and a woman who does not have hemophilia have a daughter who has hemophilia have a daughter who has hemophilia. Hemophilia is a recessive condition, and the gene is located on the X chromosome. Which of the following can be concluded?
(a) The mother is a carrier for hemophilia
(b) Hemophilia is not a sex-linked trait
© Crossing-over has occurred
(d) All subsequent daughters of this couple will have hemophilia
(e) All sons of this couple will have hemophilia

The way in which an enzyme and its specific substrate interact is best described by the
(a) fluid-mosaic model
(b) induced-fit model
© Oparin hypothesis
(d) Lyon hypothesis
(e) competitive-exclusion principle