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Biology
Biology
High School
Select the statement that correctly distinguishes between relay proteins and second messengers in signal transduction pathways. Select the statement that correctly distinguishes between relay proteins and second messengers in signal transduction pathways.1-Signal transduction pathways are multistep pathways that include relay proteins and small, nonprotein, water-soluble molecules or ions called second messengers.2-Relay proteins are the "first messengers," the extracellular signaling molecules that bind to the membrane receptor. The signal transduction pathways are then formed by the second messengers, which are the relay molecules that respond to the first messengers.3-Signal transduction pathways are multistep pathways in which relay proteins and second messengers alternate.
Biology
College
Which of A-F is not correctly matched?A.More likely to cause GI tract upset than any other microbe: virus, e.g., rotavirusB.Spirochete-causing STD: Treponema pallidumC.Intracellular foodborne pathogen that can cause meningitis: Listeria monocytogenesD.Gram-negative vectorborne pathogen that is at its most contagious if it enters the lungs: Yersinia pestisE.This Gram + bacterium causes GI problems without being in your gut: Staphylococcus aureusF.An intracellular pathogen; disease outbreaks associated with contaminated water used for commercial AC ventilation systems: Legionella
Biology
High School
__________ is a highly conserved nucleotide sequence that has been found in developmental regulatory genes in many diverse organisms.
Biology
High School
In a certain signal transduction pathway, the binding of an extracellular molecule to a cell-surface protein results in a rapid increase in the concentration of cyclic AMP inside the cell. The cyclic AMP binds to and activates cytosolic enzymes that then activate other enzymes in the cell. Which of the following statements best describes the role of cyclic AMP in this pathway?
Biology
High School
Though scientists previously believed that domestic dogs evolved from canis ______, the gray wolf, genetic analysis indicates they actually evolved from a now extinct species.
Biology
High School
A specialized plasmid vector that has an e.coli promoter upstream of a restriction site into which foreign genes can be inserted is known as a?
Biology
High School
How do transposable elements contribute to genome evolution? a. They decrease the chances for recombination of genes during meiosis. b. They carry entire genes or individual exons to new locations. c. They maintain the function of control genes. d. They cause unequal crossing over during meiosis.
Biology
High School
a mutation that occurs in a somatic cell in an organism will most likely be transferred to
Biology
High School
BR) nts A scientist crosses morning glory plants of different flower colors to determine how flower color is passed on to offspring. The results of three crosses are shown in the table. Cross W X Z Flower Color in Morning Glory Plants Flower Color of Parent 2 purple red red Flower Color of Parent 1 purple red purple Flower Color of Offspring purple red, purple The scientist crosses an offspring from cross X with an offspring from cross Z. What are the expected results of this cross? 50% of plants with red flowers, 50% of plants with purple flowers O 75% of plants with purple flowers, 25% of plants with red flowers 100% of plants with red flowers 100% of plants with purple flowers
Biology
High School
ligaments connect bones together and withstand a lot of stress. what type of connective tissue should you expect ligaments to contain?
Biology
High School
There is a certain grammar to the genetic code, orrules to follow so that the message can beeffectively translated from DNA into functionalprotein.Codons are y base "words" that code forspecific amino acids. They areand neverthe words.
Biology
High School
HELP!!!!!!!! When oxygenated blood leaves the heart through the aorta, where does it travel to next? A. to the bodyB. to the lungsC. to the heart
Biology
High School
The classification system developed by Linnaeus in the early 1700s divided living organisms into plant and animal kingdoms. Today, that has been expanded into five kingdoms. Which of the following inventions was most responsible for creating the need for the additional three kingdoms and why? (4 points)The internet allowed scientists to discuss differences between organisms easily.Genetic engineering created new species which then needed new kingdoms.Fossil fuel-based transportation made it easier to explore and discover new species.Microscopes made it possible to learn more about single-celled organisms.
Biology
High School
What is different about the outermost boundary in a plant cell compared to an animal cell?.
Biology
High School
Genetic variation among humans is relatively small when compared to other species. Where in the human genome does most of the diversity occur? a. in sequences that code for tRNAb. in the homeotic genes c. in the mitochondrial DNA d. in single nucleotide-polymorphisms
Biology
High School
Chromosomes are easiest to move around the cell when they're tightly packed. What is this process called?.
Biology
High School
a tree harvesting method that involves cutting intermediate-aged or mature trees singly or in small groups is called
Biology
High School
You work in a lab and you have discovered a brilliant method for targeted control of chromatin structure and remodeling on a gene-by-gene basis. you are specifically interested in modifying the transcription of oncogenes, which are genes whose overexpression can lead to cancer. Select which modifications you would make in cancer cells that are over expressing oncogenes. Check all that apply.
Biology
High School
which measure of ventilation is the maximal amount of air that can be moved in and out of the lungs with forced inhalation and exhalation?
Biology
High School
parent how has blood type 0, is crossed with a parent how has biood type AB. Can they possible have a child with AB blood?
Biology
High School
Which phrase from the text best supports the theme of "humanity must act with reason, not become violent like animals"?.
Biology
High School
what is one of the primary reasons given for why there are very few fossils from the earliest (pre-ediacaran fauna) animals?
Biology
High School
a chlorine oxide used to kill anthrax spores in contaminated buildings is 52.6% cl by mass. what is the name of this oxide?
Biology
College
When a material is dissolved in another material it is a(n) _____________.Group of answer choicesA. semipermeable membraneB. isotonicC. equilibriumD. solution
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