September 24, 2019

The processes of diffusion and active transport are both used to

  1.  break down molecules to release energy

  2.   move molecules into or out of cells of the

    body

  3.   bring molecules into cells when they are

    more concentrated outside of the cell

  4.   move molecules against a concentration

    gradient, using ATP molecules

Answer: Choice 2 is the correct answer

Explanation: Diffusion is the passive movement of pa...

September 16, 2019

Living Environment Regent August 2019

Base your answers to questions 36 through 39 on the information and photograph below and on your knowledge of biology.

Scientists Investigate Sex Determination in Alligators

The sex of some reptiles, including the American alligator, is determined by the temperature at which the eggs are incubated. For example, incubating them at 33°C produces mostly males, while incubation at 30°C pro...

September 13, 2019

Which group of organisms in an ecosystem fills the niche of recycling organic matter back to the environment?

August 2019 Biologu Regent Exams

(1) carnivores

(2) decomposers

(3) producers

(4) predators

Answer and Explanation:

In order for us to determine the correct answer, we need to know the definitions for each one of the answer choices. 

Carnivores are organisms that eat other animals. Examples of carnivores are lions and l...

May 21, 2019

The placenta secretes progesterone and estrogen during pregnancy. Progesterone is responsible for the following functions:
• maintains the lining of the uterus
• inhibits (interferes with) contractions of the uterus

• inhibits the production and release of eggs

 Describe one likely result if the placenta became damaged and could not maintain progesterone levels. Support your answer. [1]

The text above s...

May 12, 2019

An organ, such as a kidney, used for transplant needs to be tested for compatibility with the person who is to receive the organ. If this is not done, the

(1) donated organ might attack the body
(2) donated organ might attack the immune system

(3) immune system might attack its own body cells

(4) immune system might attack the donated organ

Answer and explanation

Organ transplants are used widely for those people, whose org...

April 2, 2019

Proteins are molecules built from amino acids. Proteins make up a large portion of our body and serve extremely important functions. These functions are:

Enzymes - biological catalysts that speed up the rate of reactions in our body.

Messengers - some hormones are proteins. Hormones are chemical messengers that are synthesized and secreted by endocrine tissues and target specific organs.

Immunoproteins - provide protection...

March 5, 2019

After being absorbed, long fatty acids come together to reform triacylglycerides and cholesterol esters. Short fatty acids pass directly into the blood where they bind albumin protein and get transported to the liver.

February 27, 2019

 Fatty acid are hydrocarbon chains with carboxylic acid at the end. Unsaturated fatty acid contain one or more double bonds, usually in cis conformation. There are two methods of naming the unsaturated double bonds, delta and omega. 

Delta naming system:

1. Count carbons starting from the carboxylic end. The total number of carbons in the fatty acid is the first number in the name.

2. The second number represents the...

February 20, 2019

P.S. How are proteins made? DNA is used as a template to make RNA in a process called transcription. RNA is single stranded and has the base U instead of T. Once RNA is modified, it leaves the nucleus and enters the cytoplasm. In cytoplasm, mRNA together with tRNA and ribosomes does the process of translation, or creation of proteins. tRNA reads the codon (3letter sequence) on mRNA and bring the correct amino acid to th...

February 2, 2019

Cytoplasm is the fluid that fills the cell and  contains all organelles and cell parts. In a multicellular organism, excretion system excretes all the wastes our body produces. Immune system protects our body from pathogens and helps prevent sickness. Reproductive system is responsible for the sexual characteristics as we well as allowing us to reproduce and form a new generation.

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