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Donavan Huang
In each generation of this family after generation i, the age at diagnosis is significantly lower than would be found in nonfamilial (sporadic) cases of this cancer (~ 63 years). what is the most likely reason?
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Karlie Lucas
Which of these is one of the only two mammals that lay eggs?

wombat

duck-billed platypus

three-toed sloth

chicken
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Desiree Ramsey
Restriction endonucleases are especially useful if they generate sticky ends. What makes an end sticky?
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Rodrigo Nunez
A scientist would like to test the effect of heat on the function of a certain enzyme. Which would not be an appropriate first step?

(1) doing research in a library (2) having discussions with other scientists (3) completing a data table of expected results (4) using what is already known about the enzyme
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Trent Porter
An aquatic ecosystem was rich in benthic microalgae and sea grasses. Over the years, industrial pollutants have reduced these populations considerably. How would this affect the ecosystem?

A) There would be no energy produced in the system.

B) There would be more energy available in the ecosystem.

C) It will increase the number of organisms at higher trophic levels.

Eliminate

D) There would be less energy transferred to the higher trophic levels.
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Lincoln Schneider
Turbidity is a term used to describe water clarity, or how clear water is. Cloudy water is said to be turbid. Turbid water may be a result of a buildup of sediments, which are pieces of rocks that have been broken down and eroded or transported by surface runoff. Human activities that remove plants in an area may increase erosion. Sediments can get into the gills of fish, which can then decrease their growth and delay development. Sediments prevent sunlight from reaching the producers of the aquatic ecosystem, such as algae. This in turn affects the food webs in this ecosystem.

Which human activities would most likely increase turbidity? Check all that apply.

cutting down trees

building roads in mountains

constructing buildings

planting gardens in vacant lots

removing sediments from sidewalks using water
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Kamari Sosa
The pH of a basic solution is less than 7 true or false
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Darwin Perkins
Which of the following uses percentages to relate the parts to the whole? a. circle graph b. line graph c. bar graph d. none of these
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Steven Wagner
What kind of limited factor is parasitism considered
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Victoria Patrick
A dominant mutation in Drosophila called Delta causes changes in wing morphology in Delta / + heterozygots. Homozygosity for this mutation (Delta / Delta) is lethal. In a population of 150 flies, it was determined that 60 bad normal wings and 90 had abnormal wings. a. What are the allele frequencies in this population? b. Using the allele frequencies calculated in part (a), how many total zygotes must be produced by this population in order for you to count 160 viable adults in the next generation? c. Given that there is random mating, no migration, and no mutation, and ignoring the effects of genetic drift, what are the expected numbers of the different genotypes in the next generation if 160 viable offspring of the population in part (a) are counted? d. Is this next generation at Hardy-Weinberg equilibrium? Why or why not?
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Chance Houston
The offspring of a cross between parents with different true breeding traits
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Brenna Jackson
Who discovered tuberculosis bacteria?
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King Wade
Which of the following cell surface modifications and/or specialized cells may be found within the epithelium that lines the trachea?

a. cilia

b. goblet cells

c. keratinization

d. microvilli
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Berlynn
A cell contains a 30% solute concentration and 70% water concentration. If the cell is placed in a

solution that is 60% solute and 40% water, what will happen to the cell, and what condition is the

cell in?
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Guest
During mitosis, what phase are chromosomes * not * visible?
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