BIOLOGY HIGH SCHOOL

What is homeostasis? an organism that obtains energy from the sun
an organism that obtains energy from another organism
maintaining stability in an organism's internal environment
a process that produces an exact copy of a parent

Answers

Answer 1
Answer: homeostasis is maintaining stability in an organisms internal environment

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A specific tRNA can only attach to a specific type of amino acid. True or False?

Answers

The correct answer is True.

The carbon footprint of an activity is used to assess environmental pollution. What does it measure?

Answers

I believe I answered a question similar to this one, not sure if it was yours but anyway.

Carbon footprint measures emission amount of Carbon dioxide { CO }_( 2 ) and Methane { CH }_( 4 )

A change in a sequence of DNA bases in a bacterial cell has resulted in a mutation. This mutation has increased the ability of the bacteria to break down and digest organic molecules in the environment. Bacteria with this mutation are better able to find and utilize food sources. According to the theory of natural selection, what is MOST likely to occur in future generations of this bacteria?A)The relative frequency of the mutation will increase as time passes.
B)Because the mutation has changed the DNA of the bacteria, a new species will be formed.
C)Because the mutation is abnormal, the mutation will become more rare with every passing generation.
D)Bacteria with the mutation will increase in number until the food supply is exhausted, causing the bacteria to become extinct.

Answers

The answer is A) The relative frequency of the mutation will increase as time passes. 

In natural selection, genotype variations that will increase the chance of survival and reproduction of some organism are preserved and will be inherited. So, the mutation could not be abnormal, since it helps bacterial survival. Also, the bacteria will not extinct because of this mutation nor the new species will be formed since this is not so big mutation.
This leaves A) as the right answer. The relative frequency of the mutated allele will increase since the more bacteria with the mutation will survive and it will be passed down to the new generation over time.

Valves called ______________ hold the food in the stomach.

Answers

Pyloric sphincter is what holds your food in your stomach

Which of the following is part of the axial skeleton?arm

pectoral girdle

pelvic girdle

skull

Answers

The bone that is part of the axial skeleton is the skull. Theaxial skeleton refers to the part of the skeleton that consists of the bones ofthe head and the trunk of a vertebrate. In the human body, there are 80 bonesfound in the axial skeleton composed of six parts: the skull bones, theossicles of the middle ear, the hyoid bone, the rib cage, sternum, and thevertebral column. 

Final answer:

The axial skeleton includes the skull, vertebral column, sternum, and rib cage. Out of the options, only the skull is a part of it.

Explanation:

The axial skeleton, one of the major parts of the human skeletal system, includes the skull, the vertebral column, the rib cage, and the sternum. Out of the options you've provided, the skull is a part of the axial skeleton. The arm is part of the appendicular skeleton, while the pectoral and pelvic girdle serve as connection points between the axial and appendicular skeletons and thus are not considered part of the axial skeleton.

Learn more about Axial Skeleton

. In fruit flies, normal wings are dominant and short wings are recessive. Construct a Punnett square wherein both parents are heterozygous for normal wings. Which of the following is the correct genotypic ratio for the F1 generation of this cross?25% of the offspring are homozygous for normal wings. 50% of the offspring are heterozygous for normal wings. 25% of the offspring are homozygous recessive for short wings.
75% of the offspring have normal wings, and 25% of the offspring have short wings.
50% of the offspring are heterozygous for normal wings. 50% of the offspring are homozygous recessive for short wings.
75% of the offspring are heterozygous for normal wings. 25% of the offspring are homozygous recessive for short wings.

Answers

Answer:

25% of the offspring are homozygous for normal wings. 50% of the offspring are heterozygous for normal wings. 25% of the offspring are homozygous recessive for short wings.

Explanation:

Let dominant allele be A and recessive allele be a

Parent 1: heterozygous normal wings = Aa

Parent 2: heterozygous normal wings = Aa

Parent 1 X Parent 2 :

     A       a

A   AA    Aa

a    Aa    aa

Genotype of progeny will be as follows:

1/4 or 25% = AA = homozygous dominant for normal wings

1/2 or 50% = Aa = heterozygous normal wings

1/4 or 25% = aa = homozygous recessive for short wings
Normal wings = WW
Short wings = ww

The Parents = Ww x Ww

A. 25% are homozygous dominate, 50% are heterozygous, 25% are homozygous recessive.
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