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December 2025

42,840 public questions were asked this month.

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Recent questions

Latest from December 2025

How did the study of the atom contribute to our understanding of the periodic table of the elements?(1 point) Responses Atoms are representative of elements, so scientists scaled up atomic characteristics to understand e...
Asked by Mason 1 answer
What is one way that a frameshift mutation could occur? (1 point) Responses three nucleotides are inserted three nucleotides are inserted three nucleotides are deleted three nucleotides are deleted two nucleotides are su...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Millions of years ago, the ancestors of giraffes had short necks and used to eat leaves from the bushes on the ground. A genetic mutation caused one giraffe's neck to be taller. This long-necked giraffe was able to eat l...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Examine the two strands of DNA below. Which kind of mutation occurred? Original strand: AGC GTA CCC TAC New strand: AGC GTA ACC TAC (1 point) Responses frameshift frameshift insertion insertion deletion deletion substitu...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Which evidence best supports the claim that mutations are a source of inheritable genetic variation?(1 point) Responses Mutations are not inheritable from gametes because they are given from each parent. Mutations are no...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Epigenetics are different than mutations in that mutations:(1 point) Responses cannot be inherited cannot be inherited can change traits can change traits can change DNA sequences can change DNA sequences can be inherite...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Which factor could increase the possibility of mutations in your offspring?(1 point) Responses smoking tobacco smoking tobacco having a mutation on a non-gamete cell having a mutation on a non-gamete cell nothing because...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Meiosis produces(1 point) Responses RNA RNA gamete cells gamete cells skin cells skin cells hydrogen molecules
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Epigenetic changes are generally(1 point) Responses heritable changes in genetic sequences of a population. heritable changes in genetic sequences of a population. not heritable genetic changes that are specific to an in...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Which modification affects an organism’s expressed characteristics while leaving its DNA sequence unchanged?(1 point) Responses deletion mutation deletion mutation substitution mutation substitution mutation insertion mu...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Which statement about chromosomes is true?(1 point) Responses Chromosomes are found in sets of three. Chromosomes are found in sets of three. DNA contains chromosomes. DNA contains chromosomes. The same number of chromos...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Which type of mutation causes cystic fibrosis?(1 point) Responses insertion insertion substitution substitution silent silent deletion
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?(1 point) Responses CCA ATA GCT CCA ATA GCT CCC TAG CT CCC TAG CT CCA TAG CT CCA TAG CT...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
A team of geologists is studying the boundary between two tectonic plates: the Nazca Plate and the South American Plate. They find that the Nazca Plate is moving underneath the South American Plate, causing frequent eart...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Scientists have observed that the Gulf Stream—a warm ocean current that moves from the Gulf of Mexico across the Atlantic Ocean toward Europe—has slowed down slightly over the past several decades. This current is part o...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
A group of students conducted an experiment to measure how much carbon dioxide (CO₂) is produced by germinating seeds over time. They placed the seeds in a sealed container with a CO₂ sensor and recorded the data every 1...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Scenario: A population of beetles lives in a forest where the trees have dark-colored bark. The beetles have two color variations: light brown and dark brown. Over several generations, scientists observed an increase in...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
A student is investigating how the type of surface affects how far a toy car rolls after being released down a ramp. The student tests four different surfaces at the bottom of the ramp: Surface A: Smooth tile Surface B:...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
A student performs a reaction between hydrochloric acid (HCl) and sodium bicarbonate (NaHCO₃) in a sealed container. The balanced chemical equation for the reaction is: HCl (aq)+NaHCO₃ (s)→NaCl (aq)+H₂O (l)+CO₂ (g) Befor...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
What is heredity?(1 point) Responses the exchange of genetic information to create new variation the exchange of genetic information to create new variation the random distribution of chromosomes to produce new genetic c...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
During meiosis, non-sister chromatids may exchange sections of DNA leading to genetic diversity. What is this process called?(1 point) Responses karyotypes karyotypes crossing-over crossing-over independent assortment in...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Which of the following is a difference between phase I and phase II of meiosis?(1 point) Responses Genetic variations can only occur during phase II of meiosis. Genetic variations can only occur during phase II of meiosi...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
The inheritance pattern of one gene will not affect the inheritance pattern of another gene. This is known as(1 point) Responses independent assortment. independent assortment. random distribution. random distribution. g...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Why is it important for gametes to be haploid?(1 point) Responses It is impossible for them to be diploid because reproduction does not result in diploidy. It is impossible for them to be diploid because reproduction doe...
Asked by hfgnljxghcfjdgj/xk.cbh 1 answer
Regarding Germany, the Treaty of Versailles 1. led to policies that caused hyperinflation in Germany. 2. sought to end the Second World War without the undue suffering of average German citizens. 3. placed post-First Wor...
Asked by l 1 answer