Biology Answers

Discuss on the effect of climate change on agriculture.

Say what climate change means, causes of climate change and the effect and how to subdue it

Euglena is different from ameoba in?

The law of independent assortment states what?

could you please help me write a balanced chemical equation to show the dissociation of propanoic acid (C₂H₅COOH) with its states symbols.

and a balanced chemical equation to show the dissociation of sodium propanoate (C₂H₅COONa) also with its state symbols.

1. How do you calculate magnification?
2. What is the orientation of the e in the microscope?
3. The slide is on 4X objective. Adjust the coarse focus then the fins focus until you get it clear. What did you discover about the adjustment?
4. Now move to 10X. what happened to the “e”. How much much can you see?
5. When you went to the 10X did you need focus?
6. Play with the the light adjustment (the diaphragm). what happened when you move the night adjustment to the left? to the right?
7. What do you do if the light is too dull or bright?
8. What happened to the e? How much can you see?
9. A microscope has 20X ocular (eyepiece) and an objective of 10X. What is the magnification?
10. A microscope has 20X ocular (eyepiece) and an objective of 43X. What is the magnification?
11. Explain Why the light microscope is also called the compound microscope?
12. Explain what happens to the “e” when you look at it under the microscope

Website if needed- ncbionetwork.org/iet/microscope

1. what is one of the most important parts of a microscope?
2. What is the typical power of the eyepiece?
3. How do you carry a microscope?
4. what does the course adjustment do?
5. what does the course adjustment do?
6. what does the fine adjustment do?
7. what are the objective lenses?
8. what is the stage?

Black hair (B) is dominant to red hair (b). If there are 175 black haired people in a population of 250: (Answer in percent or decimal).

A. What is the predicted frequency of heterozygotes? 

B. What is the predicted frequency of homozygous dominant? 

C. What is the predicted frequency of homozygous recessive?

A population of birds contains 23 animals with red tail feathers and 66 animals with blue tail feathers. Blue tail feathers are the dominant trait. (Answer in percent or decimal)

A. What is the frequency of the red allele?

B. What is the frequency of the blue allele?

C. What is the frequency of heterozygotes?

D. What is the frequency of birds homozygous for the blue allele?

A population of squirrels may be brown (the dominant phenotype) or red (the recessive phenotype). Brown squirrels have the genotype BB or Bb. Red squirrels have the genotype bb. The frequency of the BB genotype is 0.46.

A. What is the frequency of heterozygous rabbits?

B. What is the frequency of the B allele? 

C. What is the frequency of the b allele?

2. Solving typical and situational tasks:

The DNA section has the following nucleotide composition:

1) 3 ... AGTATSGZATGZATTATATSATGZTSGC .... 5 . Write down the nucleotide composition of the daughter DNA resulting from the replication of the original DNA fragment.

Indicate which of the polynucleotide chains are old and new.

2) How many and what types of free nucleotides are required for replication of a DNA molecule in which the amount of adenine is 600,000 and guanine is 2,400,000?